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Avoid spurious non-overlapping eq error with metaclass with__eq__#19220

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Merged
JukkaL merged 1 commit intomasterfromelvis-eq
Jun 4, 2025
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4 changes: 4 additions & 0 deletionsmypy/typeops.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -1190,6 +1190,10 @@ def custom_special_method(typ: Type, name: str, check_all: bool = False) -> bool
if isinstance(typ, FunctionLike) and typ.is_type_obj():
# Look up __method__ on the metaclass for class objects.
return custom_special_method(typ.fallback, name, check_all)
if isinstance(typ, TypeType) and isinstance(typ.item, Instance):
if typ.item.type.metaclass_type:
# Look up __method__ on the metaclass for class objects.
return custom_special_method(typ.item.type.metaclass_type, name, check_all)
if isinstance(typ, AnyType):
# Avoid false positives in uncertain cases.
return True
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8 changes: 8 additions & 0 deletionstest-data/unit/check-expressions.test
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Expand Up@@ -2172,6 +2172,14 @@ class Custom(metaclass=CustomMeta): ...
Normal == int() # E: Non-overlapping equality check (left operand type: "type[Normal]", right operand type: "int")
Normal == Normal
Custom == int()

n: type[Normal] = Normal
c: type[Custom] = Custom

n == int() # E: Non-overlapping equality check (left operand type: "type[Normal]", right operand type: "int")
n == n
c == int()

[builtins fixtures/bool.pyi]

[case testCustomContainsCheckStrictEquality]
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